A social interaction in which both the donor's fitness and the recipient's fitness are increased is called

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Cooperation is a social interaction in which both the donor's fitness and the recipient's fitness are increased. Altruism refers to behavior that benefits others at a cost to oneself, without any expectation of reward or return benefit. Spitefulness refers to behavior that harms others at a cost to oneself, without any apparent benefit. Selfishness refers to behavior that benefits oneself at a cost to others, without any apparent benefit to the recipient.

A Social Interaction in Which Both the Donor's Fitness and the Recipient's